tract

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tract

1
1. Anatomy a system of organs, glands, or other tissues that has a particular function
2. a bundle of nerve fibres having the same function, origin, and termination

tract

2
RC Church an anthem in some Masses

Tract

 

in the central nervous system, any one of several groups of closely placed nerve fibers having a common morphological structure and common functions. Tracts are divided by function into associative tracts, which unite various sections of the cerebral cortex in the same hemisphere; commisural tracts, which connect both hemispheres and ensure their cooperative activity; and projection tracts, which unite the cerebral cortex with lower brain formations and, through them, with the periphery.

References in periodicals archive ?
Immunohistochemical study of basaloid squamous cell carcinoma, adenoid cystic and mucoepidermoid carcinoma in the upper aerodigestive tract.
Population attributable risk of tobacco and alcohol for upper aerodigestive tract cancer.
Saliva rinses the mucosa of the upper aerodigestive tract, and any acetaldehyde in the saliva may be taken up by mucosal cells.
The positive effects of combined treatment in individuals with carcinoma of the upper aerodigestive tract and affected prevertebral fascia have not been widely reported.
In dose-response analyses, monotonic associations were observed between cumulative internal dose and mortality from hemato- and lymphopoietic cancers and from cancers of the upper aerodigestive tract (Tables 4 and 5).
2) A second study looking at EBV-negative, predominantly undifferentiated malignancies of the upper aerodigestive tract occurring in any age at a single institution during a 16-year period found a NUT rearrangement in 5 of 28 (18%) malignancies that were screened and had interpretable FISH results.
Merkel cell polyomavirus has been detected in many tissues in the body, including the skin, the aerodigestive tract, the genitourinary tract, and the liver.
The researchers plan to continue assessing the aerodigestive tract of adult patients with optical coherence tomography.
Sidransky, Director of the Johns Hopkins University Head & Neck Cancer Research Center, published "Allelic Losses in OraTest Directed Biopsies of Patients with Prior Upper Aerodigestive Tract Malignancy" in the July 2001 edition of the Journal of Clinical Cancer Research.
a Phase I trial of Tarceva(R) (erlotinib) and Targretin as a targeted combination therapy for advanced aerodigestive tract cancers including NSCLC and head and neck cancer, and
These signs are the predisposing factors for foreign-body impaction in the upper aerodigestive tract.
For example, adenoid cystic carcinoma or mucoepidermoid carcinomas are other examples of tumors with characteristic histopathologic features that point toward likely primary sites; these diagnoses suggest an origin from a major or minor salivary gland and, less likely, lung/ aerodigestive tract, breast, lacrimal gland, and skin (1,53,54) (Figure 7, A).